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Finding the Fourth Proportional to 143.41, 214.03 and 128.04

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Solution

The fourth proportional to 143.41, 214.03 and 128.04 is: 191.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.41 : 214.03 = 128.04 : x
  2. Step 2: Convert to fraction form
    143.41/214.03 = 128.04/x
  3. Step 3: Cross multiply
    143.41x = 214.03 × 128.04
  4. Step 4: Simplify right side
    143.41x = 27,404.40
  5. Step 5: Solve for x
    x = 27,404.40/143.41
  6. Step 6: Final answer
    x = 191.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.